Machine for and method of applying transparent windows to envelope blanks



I 15, 1939. V c. PEARCE v2,169,973

MACHINE- FOR AND METHOD OF APPLYING TRANSPARENT WINDOWS TO ENVELOPEBLANKS Filed Aug. 9, 1937 6 Sheets-Sheet 1 3 11 IN vew'fiow Q) Q 3jjewl's GPearca w w 1 W4 W Aug. 15, 1939. c. PEARCE 2,159,973 MACHINEFOR AND METHOD OF APPLYING TRANSPARENT WINDOWS TO ENVELOPE BLANKS 6Sheets-Sheet 2 1 7708317 "U02" .1 ewis C'. Par' c e L. C. PEARCE Aug.15, 1939.

MACHINE FOR AND METHOD 0P APPLYING TRANSPARENT WINDOWS TO ENVELOPEBLANKS Filed Aug. 9, 1937 6 Sheets-Sheet 3 DImXGDI Aug. 15, 1939. cPEARCE 2,169,978

MACHINE FOR AND METHOD OF APPLYING TRANSPARENT WINDOWS TO ENVELOPEBLANKS Filed Aug. 9, 1957 6 Sheets-Sheet 4 I3: verifier L 65025 C. Pearce b w; anz'zfiiwmgr 1.. C. PEARCE Aug. 15, 1939.

MACHINE FOR AND METHOD OF APPLYING TRANSPARENT WINDOWS T0 ENVELOPEBLANKS 6 Sheets-Sheet 5 Filed Aug. 9, 1937 L ewis CZP-ea'rce Aug. 15,1939. 1.. c. PEARCE MACHINE FOR AND METHOD OF APPLYING I'RANSPARENTWINDOWS' T0 ENVELOPE BLANKS Fild Aug. 9, 1937 6 Sheets-Sheet 6 I11062M02 3 L ewis (lPeaPce Patented Aug. 15,1939

UNITED STATES PATENT OFFICE BLANKS Lewis 0. Pearce, Cleveland, Ohio,assignor, by mesne assignments, to William C. Labombarde,

Nashua, N. H.

Application August 9, 1937, Serial No. 158,084

24 Claims.

The principal object of my invention is to provide a machine which willapply adhesive, such as glue, over a predetermined area, less than theentire area, of a transparent window then cut through the glue as thewindow is cut from the web of window material and then apply the window,while the glue is moist, to the opening in the envelope blank. Oneadvantage is that the glue may be applied to the very edge of thetransparent window so that there will be no danger of the window beingunglued at its edge. If the window is not glued at its very edge it mayproject slightly from the envelope and be torn away from the envelopeand this is especially true as to that edge of the window which facesthe letter or other thing when the latter is inserted in the envelope.Whether the glue is applied so as to extend to all four edges or to anynumber of edges less than four may be controlled by an appropriate gumapplicator.

- Before my invention the envelope industry had sought for years toapply glue so that the windows would adhere at their edges but this wasnever successfully done because the adhesive was applied to the envelopeblank and slight variation in register would cause the adhesive tooffset with relation to the combining mechanism with consequent jammingof, and otherwise interfering with, the practical operation of themachine. Y

My use of predetermined glued areaof the transparent windows permits theuse of the cheapest glassine equally as well as the more expensiveacetate', especially because of the relatively small area which is gluedwhereas, in the prior art, the use of previously coated and, driedwindow materials sealed to the envelope blank with heat or moisturenecessarily limits the types and kinds of window material and increasescost because of the expense of the window material.

Another feature of my invention is the feedin and conveying of thedied-out apertured envelope blanks. Such blanks cannot be drawn one overanother as they tend to lock and tear through and interfere one withanother. Such interference is completely done away with by my inventionwhich provides that each blank is individually gripped and rolled awayfrom the pile or stack, the grippers maintaining positive control. andregister of the individual blanks up to, and past, the window-applyingmechanism and until the very instant that they are dischargedindividually for further operations.

Satisfactory adhesive for window envelopes should be heavy and tacky.One of the most by the glue applicator, this being done in the form 10shown by means of suction.

Another feature of my invention is means to cut through the moist gluedweb of window material combined with means to carry the moist severedwindows and register them with the en- 15 velope blanks.

Another feature of my invention is that the glue wheel travels at anextremely slow speed so that no air is churned up into the glue.Attempts have been made to move the glue roll intermittently to avoidthis objection, but these have not been successful as the glue rollapplicator must travel at the same speed as the envelope blank. With myinvention however the glue applicator travels merely the length of thewindow blank, which is only a small fraction of the space required foreach envelope.

Another feature of my invention is that the location of the transparentwindow can be varied with respect to the envelope blank, bothlongitudinally and laterally, and this also while the machine is inoperation.

Another feature of my invention is the means for cleaning the cuttingmechanism so that glue will not accumulate.

Still another feature of my invention is moving the envelope blankagainst the stationary window blank, the latter having moist gluethereon, and preferably this movement of the envelope blank is a rollingmovement.

Other features will be pointed out below.

In the drawings:

Fig. 1 is a front elevation of the machine;

Fig. 2 is a right side elevation of the machine;

Fig. 3 is a plan of the envelope blank;

Fig. 4 is a plan of the window blank;

Fig. 4a is a plan view of a modified form of window blank;

Fig. 4b is a perspective view of a preferred form of glue-applying roll;

Fig. 5 is a plan view of the envelope blank having the window appliedthereto;

Fig. 6 is a vertical cross sectional view through the machine on theline 6-6 of Fig. 1;

Fig. 6a is a sectional detail of the knife cleaning mechanism.

Fig. 7 is a detail vertical cross sectional view on the line 11 of Fig.1;

Fig. 8 is a vertical cross sectional view through the machine on line 88of Fig. 1, enlarged; I

Fig. 9 is a. detail vertical cross sectional view through a portion ofthe machine on the line 9-9 of Fig. 1, enlarged;

Fig. 10 is a plan view of the upper portion of the machine;

Fig. 10a is a detail view of a portion of the mechanism for adjustingthe window feeding and positioning mechanism;

Fig. 11 is a. detail vertical cross sectional view on line of Fig. 8;

Fig. 12 is a detail vertical cross sectional view on line |2|2 of Fig.10;

Fig. 13 is a detail vertical cross sectional view on line |3-|3 of Fig.10;

Fig. 14 is a perspective of the roll unit and carrying chains;

Fig. 15 is a detail rear elevation of the take-off roll mechanismpartially broken away.

The main drive shaft I is provided with a pinion 2 on the outside of theright side frame member I9, that is connected to a sprocket shaft gear 3through idler 4. The sprocket shaft gear 3 is mounted on a sprocketshaft 5 that carries two sprockets 6 inside and adjacent to the sideframes I9. Sprocket shaft gear 3 is connected to an upper sprocket drivegear 1 through an idler 8. The upper sprocket drive gear 1 is fixed on ashaft 9 that also carries two sprocket wheels Ill alined with sprockets6. Connecting the two sprocket wheels I0 with the two sprockets 6 arechains I I, one on each side of the machine inside and adjacent to theframes I9. Rotatably mounted in the chain I I are a plurality of shafts|2 each carrying intermediate of its ends a roll I3 that has at its endsheads I4. On the outer extremities of the shafts I2 are gears I5 thatengage toothed tracks I6, each of which is composed of two semi-circularinternal gears I1 and two sections of straight racks I8. The entiretoothed tracks I6 are secured to the inside of the frame members I9.Rotation of the shaft I transmits rotation to shafts 5 and 9 carryingsprockets 6 and I!) connected by chains upon which are mounted rolls I3causing them to move in the direction of the arrow of Fig. 8 and also torotate counterclockwise about their shafts I2, as they pass around thetrack I6.

Pivotally supported on shafts 9 are brackets 20 on the outside andadjacent to the frames I9. These brackets 20 carry a shaft 2| rotatablymounted therein and having gears 22 meshing with segments 23 secured tothe tracks I6. Said shaft 2| also has worm gear 24 secured to it at itsleft hand end, as viewed in Fig. 1, meshing with worm 25, that ismounted on left hand bracket 20 and which is operated by hand nut 26.Rotation of the hand nut 26 transmits rotary motion to shaft 2| causinggears 22 and shaft 2| to ride around segment 23 about the shaft 9. Shaft2| carries brackets 20 also about the shaft 9 for adjustment purposesand threaded bolts 21 clamp ltorackets 20 to the frames I9 in thedesired posiion.

Side frames 28 and 29 are pivotally mounted upon the shaft 2| justinside thebrackets 20 and adjusting screws 30 allow an adjustmentbetween the side frames 28 and 29 and the brackets 20 about the shaft 2|shaft 2| and the parts mounted on shaft 2| are therefore adjustable, asa unit, about the shaft 9 and the side frames 28 and 29 with the partsThe brackets 20 carrying they support are adjustable, as a. unit, aboutthe shaft 2|. These adjustments permit positioning of the six-sidedsuction roll 64 in any desired location upon the path of rolls I3.

Inner side frames 32 and 32a are pivotally mounted on shaft 2| and areconnected to tie rod 33, which also connects side frames 28 and29, (seeFig. 10). Side frames 32, 32a and the mechanism between therefore moveas a unit with side frames 28 and 29. A shaft 3| is supported by sideframe 28 and inner frame 32 and is connected by gears 34 and pinion 35,which is on fixed shaft 3|, to the gear I. The outer end of shaft 3|carries an arm 36 and roll 31 which, in cooperation with a Geneva wheel38 upon shaft 39constitute an intermittent power transmission mechanism(see Fig. 5). Shaft 39 is supported by side frame 28 and inner sideframes 32 and 32a. The resultant motion of shaft 39 is such that uponone revolution of the shaft 3| it causes one-sixth of a revotion of theshaft 39.

Upon the shaft 3| is a gear 40 adjacent the inside of the inner sideframe 32 (see Fig. 10). Said gear 40 meshes with a pinion 4| on theshaft 42 which carries the upper feed roll 43 for the web of transparentpaper 44 (see Fig. 12).

A gear 45 upon shaft 42 meshes with and drives pinion 46 fixed on shaft41. Also secured on shaft 41 is the lower feed roll 48 for the web oftransparent paper. Feed rolls 43 and 48 pull the transparent web 44 overtwo idler rolls 50 from transparent web roll 49 supported between innerside frames 32 and 32a. Shaft 41 of lower feed roll is rotatably mountedin two side arms 5| that rest upon tie bars 52 (Fig. 12). The remote endof the arm 5| from the shaft 41 is spring pressed downwardly by spring53 and the arm rests on the forward tie bar 52 causing the shaft 41 andits feed roll 48 to be spring pressed upwardly against the upper feedroll 43. A cam handle 54 is provided for releasing this pressure whilethe web is being threaded through the feed rolls.

A pinion 55 upon the shaft 42 drives a gear 56 fixed on the same shaftas the cement feeding roll 51. A doctor roll 58 driven by the gear 56 isalso provided for regulating the amount of glue on the glue-feedingroll. The lower portion of glue-feeding roll 51 runs in a glue supplybox 59 picking up the glue at its lower portion and carrying it past thedoctor roll 58 and thence to the glue applying roll 68. The glueapplying roll 69 is carried on shaft 6|, said shaft 6| being driven bygear 45 meshing with pinion 62 on glueapplying roll shaft 6|.

The glue-applying roll 69 is provided with two I slightly largerthan theopening of the envelope 7 blank shown in Fig. 3, Fig. 4, showingtheextent of the glue indicated at 63, the purpose being to prevent theglue from reaching the cutout portion of the envelope. All of the abovementioned feeding rolls and glue-applying mechanism are rotatedcontinuously while blanks are in position to be operated on, all beingdriven from the shaft 3 I, said rolls and mechanism stopping when thereis no blank present.

In Fig. 412 I show a form 80a of glue-applying roll mounted on shaft 6|csimilar to shaft 6|. This roll applies glue to only two margins of thewindow element.

The shaft 39 has a six-sidedsuction roll 64 secured to it. Said suctionroll 64 has twelve longitudinal bores 65 running throughout its en-.

tire length. These are connected to the periphery of the roll 64 byopenings 66 arranged in two rows on each face of the roll 64. A collar61 slidably adjustable upon the shaft 39 and provided with pistons 68one in each bore 65 is used for blocking oifv as many of the holes 66 asdesired, depending upon the width of the transparent paper web 44 (seeFig. 10). On the opposite end of the roll 64 a valve 65 is provided sothat contact by suction is provided between the web 44 and the upperforward and lower surfaces of the roll, as viewed from the front of themachine. This suction therefore holds the web 44 of transparent paperupon the roll' 64 until it has been glued to the envelope blank I0. Aportion of the valve II is spring pressed towards the valve member 65 byspring I2 and is geared directly to continuously rotating shaft 42 bymeans of gearing 13. Valve member 65 is held stationary by a bracket tothe cross bar I9, while roll 64 is rotated intermittently.

It has heretofore been stated that the feeding rolls 43 and 48 arerotated continuously to advance the web 44 of transparent material tothe suction roll 64. It has also been pointed out that the shaft 39,upon which the suction roll 64 is fixedly secured, is intermittentlyrotated by the Geneva wheel 38 which is secured to the shaft 39 andactuated by the arm 36 and roll 31 of the shaft 3 I. The continuousrotation of the feeding rolls 48 and 42 during the time that the suctionroll 64 is at rest will advance the web of transparent materialsufliciently to form a slack loop as illustrated in Fig. 8. When howeverthe suction roll 64 is actuated by the Geneva mechanism it is rotated atasufflciently higher rate of speed than the speed at which the web iscontinuously advanced by the feed rolls 48 and 42 to take up the slackand draw the web tightly upon the peripheral face of the cylinder sothat when suction is applied through the opening 66 the section of theweb which engages the periphery of the cylinder .will be held smoothlyand tightly thereupon by suction.- Suction is maintained upon portionsof the web thus caused to adhere to the periphery of the cylinder as thecylinder is rotated to cutting position in which the section is severedtherefrom and the section is still maintained in contact with theperiphery of the suction cylinder until the section forming the windowis applied to the envelope blank as illustrated in Fig. 8.

Roll 64 has at the apex of its sides slots I5 through which pass theslot-cutting knife I6 when the roll 64 is not rotating. Knife 16 isfastened to chain 11, which is mounted over sprockets I8 on cross bar I9between the two inner brackets 32 and 320,. Roll 19a is rotatablymounted in a water box 19b mounted on cross bar I9 and cooperates with aroll 190 which is held downwardly by a spring 19d. The knife 16 passesbetween the rolls 19a and 190, the lower of which runs in a water bathin box 1% to clean the knife I6 as it passes between said rolls. A pairof bevel gears 80, one of which is fixed on shaft 8|. drive the chain'11. The shaft 8| is driven from the continuously operating shaft 3| bymeans of gears 82. The knife I6 enters into the slot I5 and traversesthe entire length of said slot to effect cutting of the transparentpaper web 44 in order to cut up the continuous web into sections ofsuitable size to cover the opening in the envelope blank I0. The edge ofthe suction roll 64 and the adjacent reach of the chain II are at aslight angle to effect a shearing cut of the knife I6 on the web 44. Acam 83 on shaft 8|, in cooperation with a roll 84 mounted on a bellcrank lever 85, locks the shaft 39 in six successive positions when theshaft 39 is not being driven through its intermittent driving mechanism.

By reason of the construction above described it will be obvious thatthe web of transparent paper or window material is maintained in contactwith the periphery of the vacuum cylinder by vacuum alone from the timethe web of material is drawn taut upon the upper surface of the cylinderuntil a section thereof is brought into registry with the travelingblank to which it is to be applied and. that this adhesion of thetransparent material to the suction roll is maintained dining theseverance therefrom of the'sections which are to be applied to thesuccessive traveling blanks.

In the construction illustrated a plurality of sections have beensevered from the web at the time the foremost is applied to thetraveling blank, or in other words the continued rotation of the suctionroll carries the severed section and also carries a previously severedsection into contact with the traveling blank.

A stack of envelope blanks I rest on two rods 81 which are adjustablecrosswise of the machine by means of threaded screw 88. Rods 81 arecarried by bars 89 which are adjustable vertically by means of adjustingscrews 90. Rods 81 and bars 89 are clamped to a cross rail 9| by setscrew 92, said cross rail 92 being rigidly mounted between the sideframes I9 of the machine. Fin gers 93 support the extreme ends of theenvelope blank I0 and fingers 94, which are mounted on bars 95, alinethe top portions of the blanks I0.

,Bars 95 are also adjustable on the cross rail 9|.

The lower corner of the blank I0 rests on adjustable plates 96, thelower of which is cut out at its innermost end to allow ablank-releasing finger 91 to pass through. Two spring pressed supportingmembers 98 also hold the innermost blank I0 of the stack near itslowermost point. Blank-releasing finger 91 is slidably mounted on key 99and resiliently mounted to bell crank arm I00 by pin IOI .and springI02.

The innermost end of bell crank arm I00 is held upwardly by spring I03,the upper end of which is fastened to cross rail 9|. The bell crank armI00 is pivoted on cam lever I04, said cam lever I04 carrying a roll Ithat engages a cam I06 on main drive shaft I. This cam lever I04 ispivoted on rod I01 and actuated upwardly and downwardly by cam I06 toeffect the releasing desired time. Pivotally mounted on rod I0'I is asecond cam lever I08 that carries a roll I09 which, in conjunction withcam I I0 on shaft I, effects an upward and downward motion of the camlever I08 about the rod I0I. On the end of cam lever I08 is pivotallymounted a bell crank arm III carrying a roll II2 actuated by a cam H3.The operation of cam I I3 causes a rotation of the bell crank arm IIIabout its pivot on cam roll arm I08. The cam roll II2 rotates idly abouta pin II4 fastened in the bell crank arm III and in a bracket I I5,which is also secured to pin I I4. Bracket I I 5 carries a suction tubeI I6 which extends upwardly to a point adjacent the lowermost corner ofthe blank I0. The combined motion transmitted by cams IIO to cam rollI08 and cam II3 to bell crank arm III effect a movement to the suctiontube I I6, causing it to raise up behind the lowermost corner of theinner blank I0 of the lowermost corner of the blank I0 at the andcontact the same, then receding away from the stack of blanks to aposition where this end of the blank I0 may be picked up byblank-carrying means upon rolls I3. Then the suction tube H6 is moveddownwardly and out of the path of the rolls I3.

A bracket I06a secured to the cross rail 9| carries a lever I06b, oneend of which contacts a cam bump I060 and the other end of which carriesa hammer I06d, a spring I06e being provided to hold the hammer I06dnormally against the cross rail 9|. The cam bump I060 on the hub of thecam I06, upon passing one end of the lever I06b, allows the spring I06eto pull the hammer I06d against the cross rail 9| and effect a vibrationin the stack of blanks I0 to facilitate the operation of the suctiontube H6 and the blank-engaging fingers 01. A valve I I611. on shaft Icontrols the interval when the suction is applied within the tube II6,that is, when it engages the end of the blank I0 until the time the jawsI 23 engage the end of the blank.

The fingers 91 are moved downwardly at the time the suction tube isapplied to the end of the blank I0 freeing the same. Mounted in theheads I4 of the roll I3 is a shaft I20, which is provided on its righthand end with a dog I2I and inside of the roll I3 carries two fingersI22. Loosely mounted on rod I20 are two envelope blank engaging jawsI23. Between the fingers I22 and jaws I23 is a spring I24, whichnormally holds the envelope blank-engaging fingers against the outersurface of the roll I3. A'trip dog I25 is rigidly mounted to the insideof the right frame of the machine to contact the dog I2I and effect anopening of the blank jaws I23 at the proper time and place, that is,when they come adjacent to the end of the innermost blank as it is heldby the suction tube II6. As the roll I3 passes this point, the dog I2Iis returned to its normal position by a spring I26 closing theblank-engaging jaws I23 on the lower portion of the blank I0. Furthermovement upwardly of the roll I3 rolls the blank up on it. As it isrolled past the roll 64 holding the cut-up web with the glued sidedownwardly, the suction is taken off the lowermost section of the weband the envelope is allowed to contact this section gluing the twotogether. Further movement of the roll I3 in its orbit carries it aroundto a point adjacent a pickoff roll I30 provided with a rubber nozzleI3I.

Roll I30 is mounted on shaft I32, said shaft being driven from the gearI by gears I33 and I34. A valve I35 is mounted on a sleeve I63 securedin the frame I9 by screw I31 and suction is provided by this valve atthe proper time to effect a pick-up of the blank 10 by the nozzle I3I asthey contact. A releasing dog I40 controlled by a cam I4I on conveyorshaft I42 strikes the dog I2I at the time the blank is contacted by thenozzle I3I to efiect a releasing of the blank from the roll. Conveyorshaft I42 is driven from gear 8 by means of gear I43. Sprockets such asI44 on conveyor shaft I42 carry chains such as I45 to convey thecompleted blank to a folding machine.

As the blanks I0 are rolled up on the drums I3 and as the drums I3 movein an upwardly direction, they pass a contact wiper of a usual type. Ifa blank is on the drum I3 no electrical contact is made between the drumand the contact memher, but if no blank is on the machine a connectionis made whereby the relay I5I is ener-.

gized causing the lever I52 to be pulled down at its end adjacent therelay. The book end of the lever I52 then becomes engaged from a pin I53mounted on clutch lever I54, causing clutch lever I 54 to drop anddisconnect the outside end of shaft 3I from the inside end throughone-revolution clutch I55. A cam I56 actuates a reset lever I5'I securedto pin I 58, to which clutch lever I 54 is also secured. Thisinterruption of motion between the inner and outer ends of the shaft 3|prohibits the feeding of the web 44 when no blank I0 is being carried bythe drum I3. A switch I 60 operated by a cam I BI is in series with thecontact member to also eifect breaking the electric circuit through therelay I5I.

In general, the operation consists of picking up a blank I0 by a roll I3and rolling it past a section of the web 44 that has a predeterminedarea of moist glue upon it, then conducting the roll I3 to a take-offroll I30 which deposits the assembly of the blank and the portion of theweb on a conveyor I45, the cut-01f portion of the web being applied tothe web while the glue is moist.

As the chain II is rotated clockwise, as viewed in Fig. 8, it carriesone of the rolls I3 to a point adjacent the lower tip of the blank 10.At this point the dog I2I on the shaft I20 carried by the 1 gocounterclockwise and upwardly, as viewed in Fig. 8, causes the blank I0clamped by the jaws I23 to be rolled up on the drum I3. The web 44 isfed at a. predetermined rate by the web-feeding rolls 43 and 48 past aglue-applying roll 60, that applies moist glue over a predeterminedarea. 1

The web is then fed on to a six-sided roll 64, each face of which isconcaved to the path taken by the peripheries of the rolls I3 as theypass around shaft 3 as their axis. A knife I6 cooperates with slots I5in roll 64 to cut up the web 44 in sections to be applied to theenvelope blanks I0. The rolls I3, as they roll by the suction roll 64,pick up the web section so that they are superimposed over the cut-outportions of the blank I0. Continued movement of the rolls I3 cause thedogs I2I to be engaged by a cam operated trip dog I40 to effect thereleasing of the end of the blank by the jaws I23 and allow the nozzle I3I on the drum I30 to pick up the blank I0 and deposit it upon theconveyor I45.

By reason of the present invention therefore I have produced a novelmethod of applying transparent windows to an apertured envelope blankwhich consists essentially in applying adhesive to predeterminedmarginal areas of a web of transparent window material, then cutting theweb of transparent material through the adhesive so that the adhesivecompletely covers the edge portions of the window and cause itunfailingly to adhere to a portion of the blank which surrounds theaperture of the envelope, and then applying the window when thus severedfrom the strip to the envelope while the adhesive is still moist.

The method further comprises applying to a strip of transparent materialpredetermined areas of adhesive at intervals corresponding to themarginal portions of adjacent windows, cutting the strip through theadhesive, positioning the window, then presenting an apertured windowenvelope to the positioned window in such manner that the window will betransferred from the positioning means and applied to the envelope overthe aperture thereof, and finally removing the envelope from theposition in which the window is applied to it.

It will be understood that the particular embodiment of the inventionshown and described herein is of an illustrative character and thatvarious changes in construction of the machine and in the method ofapplying to apertured envelopes windows having the marginal portionthereof coated with a moist adhesive may be made within the spirit andscope of the following claims,

Having thus described the invention, what is claimed as new, and desiredto be secured by Letters Patent, is:

1. The method of applying a transparent window to an apertured envelopeblank consisting in applying wet adhesive to predetermined narrow areasof a web of transparent material through which the cutting of the windowblank from the web takes place, then cutting through the web andadhesive while the latter is moist to sever the window from the web insuch manner that the moist adhesive extends to the edge of the windowand then applying the severed window while the adhesive is moist aroundthe aperture in the envelope blank thereby causing the window to beglued along its very edge to the envelope blank.

2. The method of applying a transparent window to an apertured envelopeblank consisting in feeding a window with moist adhesive thereon to aposition .ofrest, feeding a portion of the envelope blank adjacent tosaid aperture into engagement with the portion of the stationary windowhaving moist adhesive thereon to cause adhesion between the window andblank and then feeding the window and blank, adhering together, awayfrom said position of rest.

3. The method of applying a transparent window to an apertured envelopeblank consisting in feeding a window with moist adhesive thereon into aconcave position of rest, rollinga portion of the envelope blankadjacent to said aperture into convex engagement with the portion of thestationary window having moist adhesive thereon to cause adhesionbetween the window and blank,

and then feeding the window and blank, adhering together, away from saidposition of rest.

4. A machine for applying transparent windows to apertured envelopeblanks comprising from the blank takes place, each of said areas being aperipheral part only of the entire area of each window to be cut fromsaid web, means to cut through the web and the moist adhesive area,thereby to sever each window from the web, an endless carrier havingmeans for successively feeding said envelope blanks to cause registry ofthe window apertures therein with the -severed window, and means tocause the adhesive-coated peripheral edge area of each window to engagethe envelope blank adjacent to the aperture in said blank while theadhesive is still moist, thereby insuring adhesion of the peripheraledge of the window to the envelope blank.

5. A machine for applying transparent windows to apertured envelopeblanks comprising means for supporting a stack of envelope blanks, meansto feed a web of transparent material, means for applying moist adhesiveto predetermined areas thereof through which the cutting of the windowfrom the blank is to take place,

means for cutting through said web and moist adhesive to form a windowhaving moist adhesive extending to its edge throughout its periphery,means to feed the window having adhesive thereon into position to engagean envelope blank, and means to engage positively an envelope blank andcarry it from the stack into adhesive engagement with said window and tocarry the blank and window adhering together away fromsaid position.

6. A machine for applying transparent windows to apertured envelopeblanks comprising means for sup-porting a stack of envelope blanks,means to feed a win-dow having adhesive thereon into position to engagean envelope blank, means to engage positively an envelope blank and tocarry it from said stack into adhesive engagement with said window andto carry the blank and window, adhering together, away from saidposition, and means to free the blank and adhering window from saidengaging means.

7. A machine for applying transparent windows to apertured envelopeblanks comprising means for supporting a stack of envelope blanks, meansto feed a window having adhesive thereon into a stationary position inconcave form to engage an envelope blank, a roll, means carried by theroll to engage positively an envelope blank and carry it from said stackin convex form around said roll into adhesive engagement with saidwindow and to carry the blank and window. adhering together, away fromsaid position.

8. In a machine of the character described a set of juxtaposed feedingand adhesive applying rolls acting continuously to feed and to applyadhesive to predetermined narrow areas of a web of transparent windowmaterial; means to receive material from said applying means, andreceiver actuating means to control the registry of said material onsaid receiving means'with relation to said feeding means as saidmaterial leaves said applying means.

9. In a machine of the character described a set of juxtaposed feedingand adhesive applying rolls acting continuously to feed and to applyadhesive to predetermined narrow areas of a web of transparent windowmaterial, rotatable means to receive said material from said applyingmeans, and suction means carried by said receiver and receiver actuatingmeans to control the registry of said material on said receiver withrelation to said feeding means as said material leaves said applyingmeans.

10. In a machine of the character described the combination of means toapply adhesive to a web of transparent window material, means to feedsaid web away from said applying'means including a rotary member havinga plurality of concave portions on its periphery, means to rotate saidrotary member intermittently, suction means to hold said web in concaveform in said concave portions, means to sever a window from said web,said suction acting to hold said window in position after suchseverance, means to feeu an envelope blank in convex form into adhesiveengagement with said severed window, and means to render the suction onsaid severed window inactive after said adhesion has taken place.

. 11. In a machine of the character described the combination of meanstofeed a web of transparent material having moist adhesive areastransversely thereof, a cutter, means for moving said cutterlongitudinally of said web to cut a window section from said web at theportion of the latter where there is moist adhesive, and

means to wash said cutter after each severance of a window section fromsaid web.

12: In a machine of the character described the combination of means tofeed an envelope blank into position for adhesive engagement with awindow, means to feed said window, carrying adhesive, into position foradhesive engagement with said blank, and means for varying the locationof said window with relation to said blank for said adhesive engagement,such variation being longitudinally as well as laterally of the machine.

13. In a machine of the character described the combination of means tofeed an envelope blank into position for adhesive engagement with awindow, means to feed said window, carrying adhesive, into position foradhesive engagement with said blank, and means for varying the locationof said window with relation to said blank for said adhesive engagement,such variation being longitudinally as well as laterally of the machine,said varying means being operative whether the machine is operating ornot.

14. A machine for applying transparent windows to apertured envelopeblanks comprising means for feeding a strip of transparent material,means for successively applying adhesive to predetermined areas of saidstrip corresponding to marginal areas of adjacent windows, anintermittently rotatable window-positioning member having pneumaticallyoperable means to engage a window area of said strip having the moistadhesive applied thereto, a cutter, means for moving the same lengthwiseof said positioning means to sever a window from said strip through theadhesive-coated area while attached to said positioning member, andmeans for successively presenting apertured envelope blanks in registrywith said window-applying means to cause the window to be applied overthe aperture thereof.

15. A machine for applying transparent windows to apertured envelopeblanks comprising means for feeding a strip of transparent material,means for successively applying adhesive to predetermined areas of saidstrip corresponding to marginal areas of adjacent windows, anintermittently rotatable window-positioning member having pneumaticallyoperable means to engage the window area of said strip having the moistadhesive applied thereto, and provided with longitudinal slotscorresponding to the width of the window, means for severing a windowpane from said strip lengthwise through the adhesive-coated area whileattached to said positioning member comprising an endless chain having acutting blade, and means for intermittentlyv actuating said chain tocause said blade to pass successively through said slots, and means forsuccessively presenting the apertured envelopes to said window-applyingmeans to cause the window to be applied over the aperture thereof,

16. A machine for applying transparent windows to apertured envelopeblanks comprising means for supporting a stack of envelope blanks, atraveling carrier having means to engage and successively move saidblanks from the stack and present them to a window feeding andpositioning means comprising intermittently operable means for feeding astrip of transparent material, means for successively applying adhesiveto predetermined areas of said strip corresponding to marginal areas ofadjacent windows, an intermittently rotatable window-positioning memberhaving means to receive the window area defined by the moist adhesive,means for severing a window from said strip lengthwise of theadhesivecoated portion thereof while on said positioning means, andmeans for applying a window to said blank over the aperture thereof.

17. A machine for applying transparent windows to apertured envelopeblanks comprising means for supporting a stack of envelope blanks, atraveling endless carrier provided with a series of rotatable rollshaving means to engage and successively remove said blanks from thestack and present the same to a window-feeding and positioning means,comprising a rotatable member having means to receive and hold a windowhaving a moist adhesive upon the marginal area thereof, and means foractuating said rotatable member and said rolls in proper correlation toapply the window to the envelope blank accurately over the aperturethereof.

18. A machine of the class described, means for positively andcontinuously feeding a web of transparent material, means for applyingadhesive to predetermined transverse areas of said web during thecontinuous movement of saidweb, a rotary drum having suction means toengage the web of transparent material delivered from said feedingmeans, means for intermittently rotating said drum, means for cuttingsaid web of material while on said drum comprising a knife cooperatingwith said drum and means for mov-- ing said knife lengthwise of saiddrum in coordination with the intermittent movements of said drum tosever predetermined lengths of said transparent material from said webthrough the adhesive coated areas thereof, and means for applying saidsevered lengths of transparent material successively to suitable blanks.

19. A machine of the class described, means for positively andcontinuously feeding a Web of transparent material, means for applyingadhesive to predetermined areas of said web during the continuousmovement of said web, a rotary drum having suction means to engage theweb of transparent material delivered from said feeding means, means forcutting said web of material while on said drum comprising means foractuating said cutting means in coordination with the rotation of saiddrum to sever predetermined lengths of said transparent material fromsaid web, means for feeding blanks in cooperative relation to thesevered areas of transparent material carried by said drum, and meansfor adhesively securing together said-transparent areas and said blanksin predetermined relation.

20. A machine of the class described, means for adhesively uniting twosheets of material on predetermined areas, comprising a continuouslymoving blank carrier, a cooperating suction roll having a plurality ofrows of vacuum holes, means for continuously feeding a web oftransparent material to said suction roll, means for rotating saidsuction roll at a greater peripheral speed than the speed at which theweb is fed to said suction roll, means operable successively to seversections of transparent material from the web, and means for causing thesuction to hold the end portion of the web of transparent material incontact with the drum and also to hold a previously severed sectionagainst the drum during the progressive application thereof to atraveling blank.

21. A machine of the class described, means for adhesively uniting twosheets of material on predetermined areas, comprising a continuouslymoving blank carrier, a cooperating suction roll having a plurality ofrows of vacuum holes, means for continuously feeding a web oftransparent material to said suction roll, means for rotating saidsuction roll at a greater peripheral speed.

than the speed at which the web is fed to said transparent material fromsaid web, said vacuum serving unaided to hold the transparent materialupon said cylinder until it registers properly with the traveling blank.

22. A machine of the class described, means for adhesively uniting twosheets of material on predetermined areas, comprising a continuouslymoving blank carrier, a cooperating suction roll having a plurality ofrows of vacuumholes,means for continuously feeding aweboftransparentmaterial to said suction roll, means for rotating saidsuction roll at a greater peripheral speed than the speed at which theweb is fed to said suction roll, cutting means cooperating with saidsuction roll successively to sever sections of transparent material fromsaid web, said vacuum serving unaided to hold the transparent materialupon said cylinder and prevent disturbance thereof by the action of thecooperating cutter, and thereafter to carry the severed section intoproper registering position with the traveling blank.

23. A machine of the class described, means for adhesively uniting twosheets of material on predetermined areas, comprising a continuouslymoving blank carrier, a cooperating suction roll having a plurality ofrows of vacuum holes, means for continuously feeding a web oftransparent material to said suction roll, means for rotating saidsuction roll at a greater peripheral speed than the speed at which theweb-is fed to said suction roll, cutting means cooperating with saidsuction roll successively to sever sections of transparent material fromsaid web, said suction operable to retain a plurality of said severedsections on said suction roll, and means for progressively releasing thesevered sections therefrom as the sections are joined progressively witha continuously moving blank.

24. A machine of the class described, means for adhesively uniting twosheets of material on predetermined areas,,comprising a continuouslymoving blank carrier, a cooperating suction roll having a plurality ofhows of vacuum holes. means for continuously feeding a web oftransparent material to said suction roll, means for rotating saidsuction roll at a greater peripheral speed than the speed at which theweb is fed to said suction roll, means for severing sections oftransparent material from said web including a cutter movable relativelyto the periphery of said drum, complementary means in the periphery ofthe drum, means for actuating said cutting means in coordination withthe-rotation of said suction roll and the continuously operableblankfeeding means to cause the severance of sections of predeterminedlength from the web and means controlling said suction to cause theadherence of the severed section to the suctionroll until such sectionis brought into registry with the traveling blank.

LEWIS c. PEARCE.

